This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A173869 #3 Mar 31 2012 13:23:39 %S A173869 1,2,2,6,6,4,24,24,18,24,10,120,120,120,120,90,80,26,720,720,720,480, %T A173869 720,720,300,480,540,300,76,5040,5040,5040,5040,5040,5040,3360,3780, %U A173869 3360,5040,2100,2100,2520,1092,232,40320,40320,40320,40320,25200,40320 %N A173869 Irregular table T(n,k) = A164341(n,k) * A036039(n,k) read by rows. %C A173869 The n-th row has A000041(n) columns. %C A173869 The row sums yield A111883(n) = A000085(n)^2. %C A173869 A000041 and A000085 are also relevant to the table defined by A104778. %e A173869 The row lengths of A164341 and A036039 are the same, so one can multiply %e A173869 the flattened arrays point-by-point to compute this sequence here: %e A173869 1..2..2..3..2..4.. A164341 times %e A173869 1..1..1..2..3..1.. A036039 yields %e A173869 1..2..2..6..6..4.. %Y A173869 Cf. A000041, A000085, A036039, A104778, A111883, A164341. %K A173869 easy,nonn,tabf %O A173869 1,2 %A A173869 _Alford Arnold_, Mar 12 2010 %E A173869 Definition rephrased by _R. J. Mathar_, Mar 26 2010